I really dont think you should just leave it, you need to do something. STD's can be very serious if left untreated (not saying you have one, but you could) If the itching is as unbearable as you say I cant imagine why you wouldn't want to get checked out.
Nothing to skip out on when you have something going on down there... Sounds like it could be anywhere from an STD to a yeast infection. Don't think it's a yeast infection and be in denial... It could be a nasty STD!!!
Don't skip out on the going to a doctor.
if i were to just leave it, would it make it worse? or just go away in time?
It could be a yeast infection. Vagisil makes screening kits, you pee on them and it tells you if you likely have BV or a yeast infection or any other kind of infection down there, you might want to pick one up.
Did you use a condom? If not then it could be a lot of things. Your best bet is to see a dr. if it persists.
Good luck
PLEASE HELP ME WITH THIS PEOPLE!